Geissele Automatics Ultra Duty Lower Parts Kit – AR-15/AR-10

The Geissele Ultra Duty Lower Parts Kit provides all the essential components to complete an AR-15 or AR-10 lower receiver build, excluding the trigger group, grip, and stock hardware. This kit includes the fire control group pins, takedown and pivot pins, bolt catch assembly, magazine catch assembly, trigger guard, and safety selector—all manufactured to Geissele's mil-spec standards. It's designed for builders who already have a preferred aftermarket trigger and grip or who want to customize those components separately.

All components are machined from steel with a black oxide finish for corrosion resistance and durability. The parts are drop-in compatible with mil-spec lower receivers and require standard AR assembly tools and basic armorer knowledge. The Ultra Duty designation reflects Geissele's focus on dimensional consistency and material quality for duty-grade builds.

• Part Type: Lower Parts Kit (no trigger, grip, or stock hardware)
• Compatible Firearms: AR-15, AR-10 (mil-spec lowers)
• Material: Steel
• Finish: Black Oxide
• Installation: Drop-In (standard armorer tools required)
• Includes: Fire control pins, takedown/pivot pins, bolt catch assembly, magazine catch assembly, trigger guard, safety selector